Posted by jdemaris on February 24, 2010 at 08:19:13 from (67.142.130.20):
In Reply to: Hey jdemaris posted by NCWayne on February 24, 2010 at 01:36:33:
I'm not turbo engineer, nor am I a math wiz. I was kind of hoping just to use an air cleaner off an application that I know works (like a factory setup from a GM 6.5 turbo).
I'm not building a street racer. This is a small 4WD motorhome and I'm rarely going to run the engine above it's peak torque curve -which with an added turbo, is around 2000 RPM. At that engine speed, it should have 375 lb. ft. of torque and 136 horse. That would require around 200 CFM. But, some needs to be added for dirt in filter, and those rare times when I stomp on the pedal to climb a steep hill, pass, etc.
A stock (no turbo) 6.2 run at 2000 RPM needs around 130 CFM. 6.2 (379 cubes) has a volumetric efficiency of 60%.
General rule of thumb that takes all into consideration (turbo or no turbo) is 1.5 times horsepower equals CFM need.
A stock (non turbo) 6.2 barely climbs above 120 horsepower - which comes to 180 CFM.
A 6.2 with a turbo, when driven in a "useful" RPM range, can make a max of 200 horse, thus needing around 300 CFM of air flow.
I've got another variable which is turning into an additional research project. The turbocharer I have does not match anything that Banks ever used. It fits the Banks exhaust manifold fine (no adapter), but I'm not sure if it's original or not.
The Banks system does NOT use a wastegate. Max boost is determined by the size of the turbo. I'd like to make sure this turbo isn't too big. It's possible that it's original and Banks just did not retain early records?
Turbo I have now is a Rajay Rotomaster- model 3AA1EE10B1. Housing is stamped with a A/R of .8. It's supposed to be equivalent to a TO4 turbo. Rajay catalog says it was designed for 350 gas engines - so it might be sized right. Only thing close that I find in Banks literature for the 6.2 is a Rajay T40B turbo with a 1.0 A/R ratio.
I'm not really sure yet what that means. Is the T40B bigger then the turbo I have now? I'm just trying to find out if I have to add a wastegate. Again, the turbo I have has a A/R ratio of .8. Banks only shows a turbo with a 1/0 A/R ratio. If mine is just a bit smaller, that might result is a little less boost, that will be fine. But, I know if I exceed 10 PSI boost on a 6.2, it won't live very long.
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